most of the time If I am purchasing new fabric (besides backing) I buy the fabric because I see it, love it, and believe I can use it in a number of different projects...generally if I find a pattern I want to use I start in my stash looking to see what I have that will work well for that pattern. I tend to make up my quilts as I go, don't use that many patterns- so I seldom shop to fulfill the need of a pattern- I shop to fill holes in my stash.